[ After her shopping trip with Kohran, Subaru arrived at the beach wearing a cute new bikini. That turquoise gem that's always hanging around her neck is, instead, seated firmly in an armband on her writs almost like a watch.
Besides the usual beachfront games, Subaru is here for two reasons.
1) To make sure people are playing safely in the water. If she has to play lifeguard, she will! She doesn't teach a class about this sort of stuff for nothin', you know.
And 2) to turn her Wing Road — a ribbon of runed, blue light — into a magical version of a slip-n-slide, running from a few meters in on the shore out into to dip the last several meters in the water.
(At least, until she gets too tired to maintain it.)
She only looks a little embarrassed for the people who decided to wear less clothes, but if they're happy, then that's good! ]